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Definition of adventive in English:

adventive

adjective

1That comes from outside or from some external source; extrinsically added; extraneous; foreign.

2Ecology. Originally: (of a plant) occurring in a region in which it is not native, but imperfectly naturalized, e.g. restricted to cultivated land, areas around human habitation, etc. In later use also: (of a plant or animal) occurring in but not native to the region in which it appears.

3Botany. Designating an embryo which develops asexually from a somatic cell of the ovule (e.g. the nucellus) as a result of a form of apomixis which occurs in certain plants.